Discrimination of absorption variations in two layered structure by using angular distribution of diffuse reflected light

A novel technique that is capable of discriminating absorption variations by measuring angular distribution of diffuse reflected light is presented for semi-infinite two-layered isotropic diffusive media. By using Monte-Carlo simulation, it was found that, in principle, the technique is useful to discriminate absorption variations caused in individual layers. This capability was validated in terms of partial path length as well as spatial sensitivity distribution.